Siberian Crater
Vladimir Pushkarev/Russian Centre of Arctic

Excerpt from nbcnews.com 

The mystery of the Siberian craters closer to being solved. Earlier this week, Russian descended into one of the craters that was discovered in Siberia over the . Vladimir Pushkarev, of the Russian Centre of Arctic Exploration, and his climbed down around 16.5 meters (54 feet) to the base of the crater, according to The Siberian .

At the bottom, they examined a frozen lake that extends down another 10.5 meters (34.4 feet) below the icy surface, and collected samples for further analysis. It’ not clear what exactly caused the three craters to form…

Siberian Crater Vladimir Pushkarev/Russian Centre of Arctic Exploration

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